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Q. Electronic configuration (outermost) of $Mn^{2+}$ ion(At. No. of Mn = 25) in its ground state is

The d-and f-Block Elements

Solution:

Mn(Z = 25) : $[Ar]^{18} 4s^2 3d^5$
$ Mn^{2+} : [Ar]^{18} \, 3d^5\, 4s^0$